Uniform Sector

Standard and Dual Serial Flash

GD25WD10C/05C

21

Figure15. Release Power-Down and Read Device ID Sequence Diagram

7.16. Read Manufacture ID/ Device ID (REMS) (90H)

The Read Manufacturer/Device ID command is an alternative to the Release from Power-Down / Device ID command

that provides both the JEDEC assigned Manufacturer ID and the specific Device ID.

The command is initiated by dri

ving the CS# pin low and shifting the command code “90H” followed by a 24-bit address

(A23-A0) of 000000H. After that, the Manufacturer ID and the Device ID are shifted out on the falling edge of SCLK with

most significant bit (MSB) first as shown in Figure16. If the 24-bit address is initially set to 000001H, the Device ID will be

read first.

Figure16. Read Manufacture ID/ Device ID Sequence Diagram

7.17. Read Identification (RDID) (9FH)

The Read Identification (RDID) command allows the 8-bit manufacturer identification to be read, followed by two bytes

of device identification. The device identification indicates the memory type in the first byte, and the memory capacity of the

device in the second byte. Any Read Identification (RDID) command while an Erase or Program cycle is in progress is not

decoded, and has no effect on the cycle that is in progress. The Read Identification (RDID) command should not be issued

while the device is in Deep Power-Down Mode.

The device is first selected by driving CS# low. Then, the 8-bit command code for the command is shifted in. This is

Command

0

1

2

3

4

5

6

7

ABH

CS#

SCLK

SI

8

9

29 30 31

MSB

2

1

0

3 Dummy Bytes

23 22

32 33 34 35 36 37 38

7

6

5

4

3

2

1

0

SO

MSB

Stand-by Mode

Deep Power-down Mode

High-Z

Device ID

Command

0

1

2

3

4

5

6

7

90H

CS#

SCLK

SI

SO

High-Z

8

9 10

28 29 30 31

3

2

1

0

23 22 21

24-bit address

MSB

34 35 36 37

33

6

5

4

3

2

1

0

38 39

32

42 43 44 45

41

46 47

40

7

Device ID

CS#

SCLK

SI

SO

MSB

Manufacturer ID

6

5

4

3

2

1

0

7